The error useually come up due to over heating especially during gaming or running system intensive programes. If you have recently overclocked bring it down. If not either the ram had conked out or the smbus on the motherboard.

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Try installing the original RAM and see if the computer boots up.If it does then the other RAM modules maybe incompatible or faulty.Try using additional or new of the same make and speed as your original RAM.

So the message you get on your screen is telling you that there is no signal coming from the computer, Screen and computer are different parts, the screen is not your computer.

So this means that your computer is either not connected to your screen or not turned on. if it is turned on and properly connected, you have a hardware problem, take or have someone come over to inspect the pc in person.

Parity error pops up when the memory encounters a read error. It may be a one time glitch or a sign of memory failure to come.

'Parity' is a form of error detection that uses a single bit to represent the odd or even quantities of '1's and '0's in the data. Parity usually consists of one parity bit for each eight bits of data.
On most systems, a parity error detection results in the computer system freezing entirely and the displaying of a 'Parity Error' message on the screen. The system must then be restarted.

I would run a memory diagnostic to see if your memory (RAM) is stable.

Your computer has memory problems. First check video. If video is working, you'll see an error message. If not, you have a parity error in your first 64K of memory. First check your ram's. Reseat them and reboot. If this doesn't do it, the memory chips may be bad. You can try switching the first and second banks memory chips. First banks are the memory banks that your CPU finds its first 64K of base memory in. You'll need to consult your manual to see which bank is first. If all your memory tests good, you probably need to buy another motherboard.

Hi pank,
Take a look at the BIOS setups in these machines. Business HPs and Dells have a setting to allow automatic shutdown and startup based on time. Another explanation is timer software; all of the computers I manage run a software timer that shuts down automatically at night. You might also want to talk to your network administrator since there are lots of management tools that allow remote shutdown of computer. It could be something they?re doing on purpose ?..
There are lots of other possibilities but I would check these out first since they?re more likely.
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